Electric furnace electrode



May 24, 1932. P. l.. J. MIGUET 1,859,979

- ELECTRIC FURNACE ELEGTRODE original Filed July 8 1926 fumi/M01@ Patented May 24, 1932 UNITED STATES PATENT OFFICE PAUL LOUIS JOSEPH MIGUET, F ST. J'ULIEN-DE-MAURIENNE, FRANCE, ASSIGNOR T0 SOCIETE ELECTRO METALLURGIQUE IAUBIENNE, Emmen DE MONTRICHER, 0F ST. JULIEN-DE- ELECTRIC FURNACE ELECTRODE riginal application illed July 8, 1926, Serial No. 121,189, and in France November 4, 1925. Divided and this application iiled July 3, 1930. Serial No. 465,719.

My invention relates to a composite vertical electrode and a head connection therefor.

My invention is particularly suitable for electric furnace operations which may be discontinued from time to time to permit the electrodes to be changed Without injury to the product that is being manufactured. lt is also best suited to furnace operations which employ relatively large electrodes.

One of the objects of my invention is to build a relatively large electrode at a relatively low cost.

Another object of my invention is to simplify the electrode head connection and place it so that it will not be injured by the furnace heat.

Another object of my invention is to build an electrode which may be burned very short and thereby increase the life of the electrode.

The above and other objects o my invention will be better understood from the foilowing description and accompanying drawings, 1n which:

igs. 1 and 2 are respectively a vertical section and a top plan view o1 one form of my electrode, and i Figs. 3 and 4 are respectively a vertical section and a top plan view of another form of my invention.

The electrode disclosed in the drawings is a carbonaceous electrode which is made of a plurality of preformed truncated sectors y which are cemented together with a plastic carbonaceous material. The centrai portion of the electrode is filled with a tiller which may be similar to the plastic material between the truncated sectorsy. The filler carries very little current, if any, and its princi al purpose is to prevent the furnace eat rom escaping through the center of the electrode.

The electrode in Figs. 1 and 2 is provided with a single ring of sectors y and in Figs.

g5 3 and -4 there is an inner and an outer ring of electrode sectors. The top end of the electrode is provided with a headfor an electrode holder, which comprises a water-cooled conducting element m attached to each of the electrode sectors y. The elements m are preferably made of bronze and the foot z5 of each of the .elements is permanently secured in a recess 1n the top of each of the sectors by pouring molten copper u into the recess around the foot t. Each of the conducting elements m is provided with one or two arms o, which are electromechanically connected by two plates p in the case of a single ring o sectors as shown in Figs. l and 2 or by two plates p and two rings g inthe case of the double ring of sectors y as shown in Figs. 3 and rlhis assembly is preferably made of bronze and it is held together by bolts s and the ring r 'forms a suitable place to attach the electrode supporting means. in Figures l and 2 the conducting elements m are connected through a plate to a source of current by flexible conductors o, which may be attached to each of the plates m. F or clearness only two sets of flexible conductors e are shown in each of the modifications. ln Figures 8 and 4 the conductors o are connected only to the outer ring of conducting elements m which elements carry most of the current, since most of the current normally Iiows through the outer rin of electrode sectors y. rIhe inner ring o sectors carry a small portion of the current and they are electrically connected to the outer conducting elements m through the inner elements m and ring g.

Suiicient lateral or side play is allowed in the joints between the plates p and arms o and between the ring g and the arms o to permit the electrode to expand radially upon putting the furnace into operation, and at the same time the retaining bolts s are screwed down sufficiently tight to maintain the proper electrical contact between the head elements.

il said sectors; and a central core o'f carbona- The electrode head is cooled by a cooling Afluid which circulates throu h the hollow conducting elements m. T e circulating fluid is supplied to and conducted away from' the assages in the conducting elements m b the pipes n which are provided with supp and outlet connections.

ile I have shown two of thepreferred forms of my invention, I do not wish tov be limited specifically to the details shown herein as changes in these details may be made without departing from the scope of my invention as defined in the appended claims. .v

sectional outline; a cementitious material interposed between said sectors; a core of lling material surrounded by said sectors; an electrical conductor attached to the top of each sector; a central electrode support attached to each of said conductors.

3. A composite electrode comprising a.

pluralit N of parallel, truncated sectors forming a p urahty of concentric rings of elecceous cementitious material surrounded by said sectors.

7. A composite electrode comprising a plurality of.parallel preformed carbonaceous truncated sectors arranged to form a circuy larvcros's-.sectional outline; a carbonaceous cementitious material interposed between svaidvsectors and also encasin said electrode; and a`core of filling materia surrounded by said sectors.

In testimony whereof, I ax ximg' si PAUL LOUIS JOSEPH IG ature.

trode material; a conductor attached to each l I of saidsectors; a radial arm on each of said sectors; a pair of annular clamping rings connecting the arms of'one ring of conductors to the arms of the adjacent rings of conductors; a pair of central clamping plates clamped te the inwardly projecting arms of the inner rin of conductors; and a supporting ring fix to said central clamping ring.

4. A composite electrode comprising a plurality of parallel preformed carbonaceous tluncated sectors compa'ctlyarranged to form a circular cross-sectional outline; and a carbonaceous cementitious material interposed between said sectors.

5. A composite electrode comprising a plurality of preformed, parallel, truncated sectors arranged to form a circular -cross-sectional outline; a cementitious material interposed ,between said sectors; and a core of filling material surrounded by said sectors.

6. A composite electrode comprising a plurality ofpreformed, y parallel, truncated, carbonaceous sectors arranged to form a circular cross-sectional outline; a carbonaceous lis cementitious material interposed .betweenv lao 

